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@unpublished{TUW-120218,
    author = {Hawarey, M. and Hobiger, Thomas and Schuh, Harald},
    title = {Accounting for the influences of 2nd order ionospheric terms on VLBI measurements},
    year = {2005},
    note = {poster presentation: EGU 2005, Vienna; 2005-04-24 -- 2005-04-29}
}